We upgraded all of our SOLID-STEEL FERRULE broadheads by adding a Titanium Nitride (Ti-N) coating to the ferrule. The Result: A hardened surface for increased impact durability, reduced friction for unsurpassed penetration and reduced wind drag during flight.We didn't stop there. Another 2009 upgrade: we've scalloped the ferrules to reduce surface area - this also reduces wind drag and increases penetration.